In 1753, Farinelli sent a precious manuscript from Madrid to the Empress Maria Theresa in Vienna - it contained some of the arias he usually sung during private evening concerts for the King of Spain. Among them were the celebrated Son qual nave and Quell'usignolo, for which he wrote by hand his own original da capos and cadenzas. This incredible source, offering a very unique and peculiar insight into the artistry of the famous castrato, is recorded here integrally, after a painstaking scholarly work on all the performance-related topics. The star mezzo-soprano Ann Hallenberg delivers the breathtaking original embellishments created by Farinelli with astonishing ease, making this survey through pieces written by Giacomelli, Conforto or Farinelli himself a truly delightful experience. Stile Galante and conductor/musicologist Stefano Aresi bring their usual savoir-faire and elegance to this carefully crafted project.